Abstract
A joint analysis of acoustic emission pulse amplitudes, deformation diagrams, and fracture surfaces is used to study the fracture kinetics and mechanisms of 20GL steel specimens having different hardnesses and cut from the upper fragment of a freight bogie solebar. The fracture of the steel specimens subjected to normalizing and having a uniform strength and ductility over the entire cross section proceeds continuously. The crack that nucleated in the specimens with a gradient strength distribution over the cross section after volume–surface quenching slows down in a layer of a variable strength and ductility and stops in a ductile core. The crack sizes are determined from the measured peak amplitudes of acoustic emission.
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S. A. Nikulin, V. M. Fedin, A. B. Rozhnov, et al., “Effect of volume–surface quenching on the cyclic strength of freight bogie solebar fragments,” Metalloved. Term. Obrab. Met., No. 11, 42–46 (2015).
S. A. Nikulin, V. N. Oguenko, A. B. Rozhnov, et al., “Strength of freight bogie solebar fragments after volume–surface quenching,” Deform. Razr. Mater., No. 2, 42–46 (2016).
S. A. Nikulin, V. G. Khanzhin, V. N. Oguenko, et al., “Kinetics and mechanisms of static fracture of as-cast freight bogie solebar fragments,” Deform. Razr. Mater., No. 3, 14–21 (2016).
L. N. Stepanova, A. L. Bobrov, K. V. Kanifadin, and V. V. Chernova, “Main acoustic emission signal parameters during static and cyclic tests of 20GL steel specimens,” Deform. Razr. Mater., No. 6, 41–45 (2014).
V. V. Murav’ev and O. V. Murav’eva, “Acoustic emission estimation of the growth of fatigue cracks in freight bogie solebars,” Deform. Razr. Mater., No. 9, 24–29 (2016).
V. G. Khanzhin and M. A. Shtremel’, “Quantitative information on fracture processes that is obtained from measured acoustic emission,” Metalloved. Term. Obrab. Met., No. 5, 53–59 (2009).
V. G. Khanzhin, M. A. Shtremel’, S. A. Nikulin, et al., “Estimation of the sizes of internal cracks from the peak acoustic emission amplitudes,” Defektoskopiya, No. 4, 35–40 (1990).
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Original Russian Text © S.A. Nikulin, V.G. Khanzhin, A.V. Nikitin, V.Yu. Turilina, V.I. Zabolotnikova, 2016, published in Deformatsiya i Razrushenie Materialov, 2016, No. 12, pp. 41–45.
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Nikulin, S.A., Khanzhin, V.G., Nikitin, A.V. et al. Analysis of the fracture kinetics and mechanisms of 20GL steel having different strengths using the acoustic emission parameters. Russ. Metall. 2017, 895–900 (2017). https://doi.org/10.1134/S0036029517100160
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DOI: https://doi.org/10.1134/S0036029517100160